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Fri, Sep 29, 2017 11:04 pm

Extracting data from a corrupted zip file with jar or repairing it

I received a zip file containing data captured with tcpdump on a Linux system. When I tried to open the zip file on my MacBook Pro laptop running OS X El Capitan by double-clicking on the file within the Finder, I saw an "unable to expand" error message stating "Error 2 - No such file or directory." A Microsoft Windows user who downloaded the same zip file reported that he was unable to open it, either. When I tried to unzip the file from a Terminal window using the unzip utility, I saw an "End-of-central directory signature not found" error message.

$ file Zip archive data, at least v2.0 to extract
$ unzip 
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
unzip:  cannot find zipfile directory in one of or, and cannot find, period.

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